Kinetics of Asphaltene Aggregation in Crude Oil Studied by Confocal Laser-Scanning Microscopy
Kinetics of Asphaltene Aggregation in Crude Oil Studied by Confocal Laser-Scanning Microscopy
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共焦激光扫描显微镜研究原油中沥青质聚集动力学
DOI：
10.1021/ef301594j
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发表时间：
2013
期刊：
影响因子：
5.3
通讯作者：
E. Boek
中科院分区：
文献类型：
--
作者：
C. Seifried;J. Crawshaw;E. Boek
本文介绍了不同沉淀剂、溶剂和希尔德布兰德溶解度参数δ对沥青质聚集动力学的研究结果。利用激光共聚焦扫描显微镜对原油中的聚集体进行了原位研究。我们观察到沥青质聚集动力学强烈地依赖于混合物的希尔德布兰德溶解度参数。当加入沉淀剂至沉淀起始点附近时，凝聚过程可用扩散限制凝聚(DLA)过程来描述。希尔德布兰德溶解度参数从析出点到析出区的微小变化导致了不同的动力学机制。在这种情况下，我们观察到聚集体的尺寸随着时间几乎线性增加，这是DLA和反应限制聚集(RLA)交叉的迹象。最大平均骨料直径从起始点附近的18μm增大到距起始点90μm。
This paper presents results of our study of the kinetics of asphaltene aggregation as a function of different precipitants, solvents, and the Hildebrand solubility parameter δ. The aggregation was studied in situ in the crude oil using confocal laser-scanning microscopy. We observe that the kinetics of asphaltene aggregation strongly depends upon the Hildebrand solubility parameter of the mixture. The aggregation process, which occurs when adding precipitant close to the precipitation onset point, can be described by a diffusion-limited aggregation (DLA) process. A slight change of the Hildebrand solubility parameter away from the precipitation onset point into the precipitation regime leads to a different kinetic mechanism. In this regime, we observe that the aggregate size increases almost linearly over time, which is an indication of the crossover between DLA and reaction-limited aggregation (RLA). The maximum mean aggregate diameter increases from 18 μm near the onset point to 90 μm away from the onse...